CENTURION PIPELINE L.P.

Incident Narrative

ON JANUARY 24, 2018, AT APPROXIMATELY 1900, A LEAK ON THE TANK 6690 4'' WATER DRAIN VALVE WAS IDENTIFIED BY A CENTURION PIPELINE, L.P. (CPL) EMPLOYEE. TANK 6690 IS LOCATED AT CPL'S SLAUGHTER STATION NEAR LEVELLAND, TEXAS, IN HOCKLEY COUNTY. APPROXIMATELY 0.12 BARRELS OF CRUDE OIL (5.02 GALLONS) WAS RELEASED ONTO THE TANK CONTAINMENT BERM. ALL CONTAMINATED SOIL WAS COMPLETELY REMEDIATED ON-SITE AND ALL REMEDIATION WORK HAS BEEN COMPLETED. THE FAILED VALVE WAS IMMEDIATELY REPLACED WITH AN API 6D VALVE EQUIPPED WITH DIFFERENTIAL THERMAL RELIEF (DTR). UPON SUBSEQUENT INVESTIGATION, CPL DETERMINED THE CAUSE OF THE LEAK TO BE WATER FREEZING BETWEEN THE GATE OF THE VALVE AND THE BLIND FLANGE. CPL WILL HENCEFORTH INSTALL API 6D VALVES EQUIPPED WITH DTR WHEN REPLACING LIKE VALVES IN THE FUTURE. THIS WILL PREVENT WATER FROM BEING TRAPPED AND POSSIBLY FREEZING. IF THE WATER DRAIN VALVE IS NOT EQUIPPED WITH DTR AND THE VALVE IS BLIND FLANGED, THE VALVE WILL BE SLIGHTLY OPENED TO PREVENT THIS ISSUE FROM REOCCURRING. THE FAILED VALVE'S PRECISE AGE IS UNKNOWN ALTHOUGH IT WAS INSTALLED IN THE MID-1940'S. PRECISE DATES ARE UNKNOWN DUE TO INCOMPLETE RECORDS CONVEYED TO CPL WHEN THE FACILITY WAS PURCHASED. THERE WERE NO FATALITIES OR INJURIES ASSOCIATED WITH THIS INCIDENT. NO OIL LEFT COMPANY PROPERTY. SUPPLEMENTAL FINAL REPORT FILED ON MARCH 12, 2018: THIS SUPPLEMENTAL REPORT INCLUDES THE REQUESTED CORRECTION TO PART E, 5F. WHICH INDICATES THE OVERALL FUNCTION OF THE PIPELINE SYSTEM IS >20% SMYS, NOT =<20% SMYS AS PREVIOUSLY MARKED.